Bioinspired water-enhanced mechanical gradient nanocomposite films that mimic the architecture and properties of the squid beak

Justin D. Fox, Jeffrey R. Capadona, Paul D. Marasco, Stuart J. Rowan

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Inspired by the water-enhanced mechanical gradient character of the squid beak, we herein report a nanocomposite that mimics both the architecture and properties of this interesting natural material. Similar to the squid beak, we have developed nanocomposites where the degree of cross-linking is controlled along the length of the film. In this study, we utilized tunicate cellulose nanocrystals as the nanofiller that are functionalized with allyl moieties. Using photoinduced thiol-ene chemistry, we have been able to cross-link the CNC nanofiller. In the dry state where strong CNC interactions can occur, only a small mechanical contrast is observed between the cross-linked and uncross-linked samples. However, when the films are exposed to water, which "switches off" the noncovalent CNC interactions, a significant mechanical contrast is observed between the same films. For example, at 20 wt % CNC (in the dry film), an increase in wet modulus from 60 to 300 MPa (∼500% increase) is observed after photoirradiation. Furthermore, we show that the wet modulus can be controlled by altering the UV exposure time which allows access to mechanical gradient films.

Original languageEnglish
Pages (from-to)5167-5174
Number of pages8
JournalJournal of the American Chemical Society
Volume135
Issue number13
DOIs
Publication statusPublished - 2013 Apr 3
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

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